/*
public class exercise {
    public static void main(String[]args){
        char up='A';
        char late='a';
        for (int i=0;i<26;i++){
            System.out.println(up+" "+late);
            System.out.println(up+late);
            up=(char)(up+1);
            late++;
        }
    }
}
public class exercise {
    public static void main(String[]args){
*/
 /*                                                  //数组拼接方法
public class exercise {
    public static void main(String[]args) {
        int[]arr={11,22,44,55,22};
        String str="[";
        for (int i=0;i<arr.length;i++) {
            if (i == arr.length - 1) {
                str = str + arr[i];
            } else {
                str = str + arr[i] + ", ";
            }
        }
        str=str+"]";
        System.out.println(str);
    }
}*/
/*
public class exercise {
    public static void main(String[] args) {
        int[] arr={11,55,44,22,33};
        System.out.print("[");
        for (int i=0;i<arr.length;i++){
          if (i==arr.length-1){
              System.out.print(arr[i]);
          }else {
              System.out.print(arr[i] + ", ");
          }
        }
        System.out.print("]");
    }
}*/

/*
public class exercise {
    public static void main(String[] args) {
        int[]arr={12,45,75,221,45,33,12};

        for (int i=0;i<arr.length-1;i++){   //轮循环

            for (int j=0;j<arr.length-i-1;j++){  //内部比较
                int temp=0;
                if(arr[j]>arr[j+1]){
                    temp= arr[j];
                    arr[j]=arr[j+1];
                    arr[j+1]=temp;
                }
            }
        }
        for (int i=0;i<arr.length;i++){
            System.out.print(arr[i]+" ");
        }
    }
}*/

/*public class exercise {
    public static void main(String[] args) {
        int[]arr={10,45,32,45,87,21,24};
        System.out.println(findIndex(arr,32));

    }

    public static int findIndex(int[]arr,int key){
        for (int i=0;i<arr.length;i++){
            if(key==arr[i]){
                return i;
            }
        }
        return -1;
    }
}*/

/*
public class exercise {
    public static void main(String[] args) {
        int[]arr={10,45,78,21,45,65,21};

        System.out.println(findIndex(arr,45));
    }
    public static int findIndex(int[]arr,int key){
        for (int i=0;i<arr.length;i++){
            if(key==arr[i]){
                return i;
            }
        }
        return -1;
    }
}*/

/*
public class exercise {
    public static void main(String[] args) {
       // 1698213469779
        long n=1698213469779l;
        long hs=1698213469779l%1000;
        long s=1698213469779l/1000%60;
        long h=1698213469779l/60/1000%60;
        long day=1698213469779l/60/60/1000%24;
        long mouth=1698213469779l/60/60/1000/24%30;
        long year=1698213469779l/60/60/1000/24/30%12;
        System.out.println(1970+year+"");
    }
}*/


import java.sql.SQLOutput;

/*
         整数类型      短整型           整型           长整型
           byte        short          int            long
            4            2             4               8
           小数类型
           double            float
             8                 4
             char             Boolean
             2                  1


          */
/*public class exercise {
    public static void main(String[] args) {
        System.out.println();
        byte dogAge=-128;//-2^7-2^7
        short 短整型=-32768;//-2^15-2^15
        int 整型=210000000;//-2^31-2^31
        long 长整型=2100000000000000l;
        //距离1970年过了多少年？
        long now=System.currentTimeMillis();
        long year=now/1000/60/60/24/365;
        System.out.println("双精度浮点");
        System.out.println("单精度浮点");
        //进制转换
        System.out.println(27);
        //非数
        char 字符=' ';
        char 字符1 = 1;
        char 字符2 = 65;
        System.out.println(字符);
        System.out.println(字符1);
        System.out.println(字符2);
        //布尔
        boolean 真=true;
        boolean 假=false;
        //inoutMisMatchException             输入类型匹配异常
        //ArrayIndexOutofBoundsException     数组下标越界异常

    }
}*/



/*public class exercise {
    public static void main(String[] args) {
        System.out.println("byte: " + Byte.SIZE / 8 + " bytes");
        System.out.println("short: " + Short.SIZE / 8 + " bytes");
        System.out.println("int: " + Integer.SIZE / 8 + " bytes");
        System.out.println("long: " + Long.SIZE / 8 + " bytes");
        System.out.println("float: " + Float.SIZE / 8 + " bytes");
        System.out.println("double: " + Double.SIZE / 8 + " bytes");
        System.out.println("char: " + Character.SIZE / 8 + " bytes");
        System.out.println("boolean: " + Byte.SIZE / 8 + " bytes");
        System.out.println(Long.SIZE/8);
    }
}*/

public class exercise {
    public static void main(String[] args) {
    String []str=new String[5];
       // System.out.println(str[0] +str[1]);
        char[] arr=new char[5];
        arr[0]=666;
        str[0]="hello";
       // String str[2]=4;

       System.out.println(str);


    }

    }